Mr. Green to the manager now. You’d better call him later.A. talkB. talkedC. is talkingD.

问题补充：

Mr. Green to the manager now. You’d better call him later.

A. talk

B. talked

C. is talking

D. was talking

答案：

A. talk

B. talked

(答案→)C. is talking

D. was talking

解析：本题中有个现在，表示的是现在正在进行的事，结构为be+doing，主语为单数第三人称，be用is，故本题选C。